/*
 * Copyright (C) 2006 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.util.concurrent;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtIncompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A TimeLimiter implementation which actually does not attempt to limit time at all. This may be
 * desirable to use in some unit tests. More importantly, attempting to debug a call which is
 * time-limited would be extremely annoying, so this gives you a time-limiter you can easily swap in
 * for your real time-limiter while you're debugging.
 *
 * @author Kevin Bourrillion
 * @author Jens Nyman
 * @since 1.0
 */
@Beta
@CanIgnoreReturnValue
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public final class FakeTimeLimiter implements TimeLimiter
{
    @Override
    public <T> T newProxy(
            T target, Class<T> interfaceType, long timeoutDuration, TimeUnit timeoutUnit)
    {
        checkNotNull(target);
        checkNotNull(interfaceType);
        checkNotNull(timeoutUnit);
        return target; // ha ha
    }

    @Override
    @ParametricNullness
    public <T extends @Nullable Object> T callWithTimeout(
            Callable<T> callable, long timeoutDuration, TimeUnit timeoutUnit) throws ExecutionException
    {
        checkNotNull(callable);
        checkNotNull(timeoutUnit);
        try
        {
            return callable.call();
        }
        catch (RuntimeException e)
        {
            throw new UncheckedExecutionException(e);
        }
        catch (Exception e)
        {
            throw new ExecutionException(e);
        }
        catch (Error e)
        {
            throw new ExecutionError(e);
        }
        catch (Throwable e)
        {
            // It's a non-Error, non-Exception Throwable. Such classes are usually intended to extend
            // Exception, so we'll treat it like an Exception.
            throw new ExecutionException(e);
        }
    }

    @Override
    @ParametricNullness
    public <T extends @Nullable Object> T callUninterruptiblyWithTimeout(
            Callable<T> callable, long timeoutDuration, TimeUnit timeoutUnit) throws ExecutionException
    {
        return callWithTimeout(callable, timeoutDuration, timeoutUnit);
    }

    @Override
    public void runWithTimeout(Runnable runnable, long timeoutDuration, TimeUnit timeoutUnit)
    {
        checkNotNull(runnable);
        checkNotNull(timeoutUnit);
        try
        {
            runnable.run();
        }
        catch (RuntimeException e)
        {
            throw new UncheckedExecutionException(e);
        }
        catch (Error e)
        {
            throw new ExecutionError(e);
        }
        catch (Throwable e)
        {
            // It's a non-Error, non-Exception Throwable. Such classes are usually intended to extend
            // Exception, so we'll treat it like a RuntimeException.
            throw new UncheckedExecutionException(e);
        }
    }

    @Override
    public void runUninterruptiblyWithTimeout(
            Runnable runnable, long timeoutDuration, TimeUnit timeoutUnit)
    {
        runWithTimeout(runnable, timeoutDuration, timeoutUnit);
    }
}
